Ask Ethan #44: What came first, black holes or galaxies?

There’s a supermassive black hole at the center of almost all of them, but who came first?

Ethan Siegel
Jul 4, 2014 · 8 min read
https://www.youtube.com/watch?v=08LBltePDZw
https://www.youtube.com/watch?v=UXK_EWwKDJ4
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Images credit: James Schombert of University of Oregon, via http://abyss.uoregon.edu/~js/ast123/lectures/lec24.html.
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Image credit: NASA / ESA composite.
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Image credit: Amanullah et al. (2010) (L); Kowalski et al. 2008 (R).
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Image credit: ESA and the Planck Collaboration.
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Image credit: Takeo Moroi & Tomo Takahashi, from http://arxiv.org/abs/hep-ph/0110096.
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Image credit: John Antoniadis, et al., “A Massive Pulsar in a Compact Relativistic Binary,” Science 26 April 2013: Vol. 340 no. 6131.
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Image credit: NASA/WMAP Science Team, via Wikimedia Commons user Rursus.
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Image credit: NASA, ESA, F. Paresce (INAF-IASF, Bologna, Italy), R. O’Connell (University of Virginia, Charlottesville), and the Wide Field Camera 3 Science Oversight Committee.
https://www.youtube.com/watch?v=QSivvdIyeG4

Starts With A Bang!

The Universe is out there, waiting for you to discover it.

Ethan Siegel

Written by

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.

Starts With A Bang!

The Universe is out there, waiting for you to discover it.

Ethan Siegel

Written by

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.

Starts With A Bang!

The Universe is out there, waiting for you to discover it.

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